// 实现这个项目的构建任务
const {
    src, dest, parallel, series, watch 
} = require('gulp');

const loadPlugins = require('gulp-load-plugins');
const plugins  = loadPlugins();

const cleanCss = require('gulp-clean-css');
const sass = require('gulp-sass');
const bb = require('browser-sync'),
    bs = bb.create();
const defaults = done=>{
    console.log('default');
    done();
}

const data = {
    menus: [
      {
        name: 'Home',
        icon: 'aperture',
        link: 'index.html'
      },
      {
        name: 'Features',
        link: 'features.html'
      },
      {
        name: 'About',
        link: 'about.html'
      },
      {
        name: 'Contact',
        link: '#',
        children: [
          {
            name: 'Twitter',
            link: 'https://twitter.com/w_zce'
          },
          {
            name: 'About',
            link: 'https://weibo.com/zceme'
          },
          {
            name: 'divider'
          },
          {
            name: 'About',
            link: 'https://github.com/zce'
          }
        ]
      }
    ],
    pkg: require('./package.json'),
    date: new Date()
  }
const getCss = done=>{
    return src('src/assets/styles/**.scss',{
        base:'src'
    }).pipe(sass({
        outputStyle:'expanded'
    })).pipe(dest('dist'))
}
const del = require('del');

const clean = ()=>{
    return del(['dist','temp'])
}

const style = ()=>{
    return src('src/assets/styles/*.scss',{
        base:'src'
    })
    .pipe(plugins.sass({
        outputStyle:'expanded'
    }))
    .pipe(dest('temp'))
    .pipe(bs.reload({
        stream:true
    }))
}

const script = ()=>{
    return src('src/assets/scripts/*.js',{
        base:'src'
    })
    .pipe(plugins.babel({
        presets:['@babel/preset-env']
    }))
    .pipe(dest('temp'))
    .pipe(bs.reload({
        stream:true
    }))
}

const page = ()=>{
    return src('src/**/*.html',{
        base:'src'
    })
    .pipe(plugins.swig({
        data,
        defaults:{
            cache:false
        }
    }))
    .pipe(dest('temp'))
    .pipe(bs.reload({
        stream:true
    }))
}

const image = ()=>{
    return src('src/assets/images/**',{
        base:'src'
    })
    .pipe(plugins.imagemin())
    .pipe(dest('dist'))
}

const font = ()=>{
    return src('src/assets/fonts/**',{
        base:'src'
    })
    .pipe(plugins.imagemin())
    .pipe(dest('dist'))
}

const extra = ()=>{
    return src('public/**',{
        base:'public'
    })
    .pipe(dest('dist'))
}
const serve = ()=>{
    watch('src/assets/styles/*.scss',style)
    watch('src/assets/scripts/*.js',script)
    watch('src/**/*.html',page)
    watch([
        'src/assets/images/**',
        'src/assets/fonts/**',
        'public/**'
    ],bs.reload);
    bs.init({
        notify:false,
        port:2000,
        open:true,
        files:'dist/**',
        server:{
            baseDir:['temp','src','public'],
            routes:{
                '/node_modules':'node_modules'
            }
        }
    })

}

const useref = ()=>{
    return src('temp/*.html',{
        base:'temp'
    })
    .pipe(plugins.useref({
        searchPath:['temp','.']
    }))
    .pipe(plugins.if(/\.js$/),plugins.uglify())
    .pipe(plugins.if(/\.css$/,plugins.cleanCss()))
    .pipe(plugins.if(/\.html$/,plugins.htmlmin({
        collapseWhitespace:true,
        minifyCSS:true,
        minifyJS:true
    })))
    .pipe(dest('dist'))
}
const compile = parallel(style,script,page);

// 上线之前执行的任务

const build = series(
    clean,
    parallel(
        series(compile,useref),
        image,
        font,
        extra
    )
)

const dev = series(compile,serve);
module.exports = {
    
   clean,
   build,
   dev

};